Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/PointerEqualsNode.java @ 19114:b1dbba1f3f03
Restructure CompareNode. Create constant fold utility, store condition as data field.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 04 Feb 2015 02:28:28 +0100 |
parents | f57d86eb036f |
children | 1d33f713897d |
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/* * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.nodes.calc; import com.oracle.graal.compiler.common.calc.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.util.*; @NodeInfo(shortName = "==") public class PointerEqualsNode extends CompareNode { public PointerEqualsNode(ValueNode x, ValueNode y) { super(Condition.EQ, x, y); assert x.stamp() instanceof AbstractPointerStamp; assert y.stamp() instanceof AbstractPointerStamp; } @Override public boolean unorderedIsTrue() { return false; } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) { return LogicConstantNode.tautology(); } else if (forX.stamp().alwaysDistinct(forY.stamp())) { return LogicConstantNode.contradiction(); } else if (((AbstractPointerStamp) forX.stamp()).alwaysNull()) { return new IsNullNode(forY); } else if (((AbstractPointerStamp) forY.stamp()).alwaysNull()) { return new IsNullNode(forX); } return super.canonical(tool, forX, forY); } @Override protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) { return new PointerEqualsNode(newX, newY); } }